Ce0.27Zr0.18Y0.025La0.025Al0.5Ox(CZYLA) material was prepared by coprecipitation method using cetyltrimethylammonium bromide (CTAB) and polyethylene glycol (PEG) as surfactants. The effects of the types and adding methods of surfactants on pore-forming of material were investigated in detail. The pore-forming mechanism was also speculated. The material was characterized by XRD, BET, TG-DTA and TEM. The results showed that cubic ceria-zirconia solid solution could be formed and there is no phase separation after calcined at high temperature whether or not to add the surfactants. When materials calcined at 600 ℃, 6.6 nm columnar and 5.0 nm slit pores are formed respectively by using CTAB and PEG in synthetic process. At the same time the shape of particles is transformed from nanoball to nanofiber by adding surfactants. After aged at 1 000 ℃ for 5 h the samples with CTAB still possesses a considerable part of the fibrous grains, resulting in 2~5 nm pores maintain and the surface area as high as 38.5 m^2/g. Surfactants added in the precipitation play a decisive role in the pore structures of materials.
